drcachesim memory leak in snoop filter

[brettcoon]

The drcachesim snoop filter tracks cache lines in a map of coherence_table_entry_t structs, one struct per cache line, to track the sharing state of each line. But once allocated, the struct is never removed from the map, causing the map to grow monotonically with the cumulative footprint of the trace, rather than being limited to the total line count of the tracked caches. For large traces this can cause out-of-memory errors.

Suggested fix is to delete the struct from the map once there are no caches sharing the line.

See

dynamorio/clients/drcachesim/simulator/snoop_filter.h

Line 48 in 577db95

std::vector<bool> sharers;